cleanup: fix linter errors

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```
make lint
kopia/tools/.tools/bin/golangci-lint --deadline 180s run | tee .linterr.txt
cli/command_snapshot_delete.go:5: File is not `goimports`-ed with -local github.com/kopia/kopia (goimports)

tests/end_to_end_test/end_to_end_test.go:303: Function 'TestSnapshotDelete' is too long (187 > 100) (funlen)
func TestSnapshotDelete(t *testing.T) {
tests/end_to_end_test/end_to_end_test.go:306:2: only one cuddle assignment allowed before range statement (wsl)
	for _, tc := range []struct {
	^
tests/end_to_end_test/end_to_end_test.go:517:4: only one cuddle assignment allowed before if statement (wsl)
			if expectDeleteSucceeds {
			^
tests/end_to_end_test/end_to_end_test.go:537:2: assignments should only be cuddled with other assignments (wsl)
	line := lines[0]
	^
tests/end_to_end_test/end_to_end_test.go:542:2: only one cuddle assignment allowed before if statement (wsl)
	if typeVal != "policy" {
	^
tests/end_to_end_test/end_to_end_test.go:558:2: assignments should only be cuddled with other assignments (wsl)
	restoreDir := filepath.Join(e.dataDir, "restored")
	^
tests/end_to_end_test/end_to_end_test.go:568:2: if statements should only be cuddled with assignments (wsl)
	if got, want := len(si[0].snapshots), 1; got != want {
	^
tests/end_to_end_test/end_to_end_test.go:571:2: assignments should only be cuddled with other assignments (wsl)
	snapID := si[0].snapshots[0].snapshotID
	^
tests/end_to_end_test/end_to_end_test.go:604:2: if statements should only be cuddled with assignments (wsl)
	if len(fileInfo) != 0 {
	^
cli/command_snapshot_delete.go:25:2: only one cuddle assignment allowed before if statement (wsl)
	if err != nil {
	^
cli/command_snapshot_delete.go:36:3: if statements should only be cuddled with assignments (wsl)
		if labels["username"] != getUserName() {
		^
```

...

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